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WHY DO LEAVES CHANGE COLOR in the FALL? by Deric Stowell, Colorado Master Gardener, 2014

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WHY DO LEAVES CHANGE COLOR in the FALL? by Deric Stowell, Colorado Master Gardener, 2014 Fall 2016 Volume 7, Issue 3 A Gardening and Native Plants Quarterly Colorado State University Extension-Pueblo County 701 Court Street · Suite C · Pueblo, CO 81003 · 719-583-6566 · [email protected] DIGGING DEEPER WHY DO LEAVES CHANGE COLOR IN THE FALL? By Deric Stowell, Colorado Master Gardener, 2014 This is one of my favorite times of the year, when autumn begins and the leaves turn color, and eventually fall. It’s when the other plants freeze and die off, much like my dreams. The whole leaf turning color thing in Colorado has taken on a very special cottage industry of sorts, with tours up in the mountains to see the beautiful Aspen trees. But did you ever wonder how and why a fall leaf changes color? Why the Aspens are such a bright yellow, Maples a deep red, and so-on? The process plants use to turn water and carbon dioxide into oxygen and sugar is called photosynthesis. That translates to "putting together with Beautiful autumn leaf color light." A chemical pigment produced by the plant’s leaves called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color. As summer ends and autumn closes in, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter. During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off of the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. These colors have been in the leaves all along, we just can't see them in the summer, because they are covered up by the green Red leaf color in autumn chlorophyll. The bright reds and purples and yellows we see in leaves are made mostly in the fall. The bright fall foliage colors come from anthocyanin (an-thuh-'si-uh-nuhn) and carotenoid pigments. These are potent antioxidants common in many plants; for example, beets, red apples, purple grapes (and red wine), and flowers like violets and hyacinths. In some leaves, like maple leaves, these pigments are formed in the autumn from trapped glucose. Sunlight and the cool nights of autumn cause the leaves to turn this glucose into a red or yellow color. The brown color of trees like oaks is made from wastes left in the leaves. It is the combination of all these things that make the beautiful fall foliage colors we enjoy each year. So, basically we get to witness the beautiful death of all plant life once a year, every year. INDEX Digging Deeper ................1 Fabulous Families ......... 7-8 Wicked Weeds .............. 2-3 Cover Crops .................. 8-9 African Rue ......................3 Master Gardener ............ 10 Ads, etc. ............................4 Interesting Insects ..... 11-12 Forcing Bulbs ...................5 Classes .......................... 12 Know Your Natives ......... .6 WICKED WEEDS POISON IVY (Toxicodendron rydbergii) By Orla O’Callaghan, Colorado Master Gardener, 2005, Native Plant Master, 2009 Poison Ivy, just hearing the words, makes my skin itch. This is a wicked weed you don’t want to mess with. The poison ivy plant produces a milky sap that contains super potent urushiol oil. If as little as a nanogram (one billionth of a gram) of urushiol oil comes in contact with your skin, it can cause severe itchiness, rash, inflammation and blisters. In more severe cases oozing sores occur. Symptoms can take minutes to days to manifest, and then last for 12-15 days. The first time a person comes in contact with poison ivy they may not have symptoms, because their body may not recognize the oil as a foreign substance. If Poison Ivy leaves you do react after your first exposure, it often takes longer for symptoms to appear, up to 7 -10 days after exposure. Around 90 % of people have allergic reactions to poison ivy. For the lucky few who don’t have an allergic reaction, be aware, you are not immune, just less sensitive to the oil. If you have repeated contact with poison ivy, the likelihood of you having an allergic reaction increases. There are good medicinal options to treat symptoms. Calamine lotion, Epsom salts or bicarbonate of soda may ease the itchy rash. If you come in physical contact with poison ivy, try not to touch other people or things. In the first few moments after contact, you can transfer the oil. If possible, immediately and repeatedly wash the area of skin that came in contact with the poison ivy with plenty of soap and water. If you can do this before the urushiol oil bonds with proteins in your skin, you can reduce symptoms. Once the oil bonds with the skin’s protein, it is too late. You cannot spread urushiol oil by touching the rash. At the point a rash appears, the oil has already been absorbed into the skin. Because urushiol is an oil, it can remain active for years on most surfaces, including your clothes, tools, pets’ fur, and even on dead poison ivy plants. Wash everything that may have come in contact with the poison ivy, including clothes, shoes, backpacks, tools and/or pets so you do not have further contact with the oil. Interestingly enough, animals, wildlife and livestock, can browse on poison ivy and not have allergic reactions. Urushiol oil can become airborne if the plant is burned or cut. If you breathe in the oil, you can irritate your airways, cause inflammation of your lungs, asthma or acute bronchitis. Damage to white blood cells, liver function abnormalities and fever have also been reported symptoms in patients who breathed in urushiol oil. Breathing in urushiol oil can be life threatening. Do not cut or burn poison ivy! If you need to remove poison ivy Western Poison Ivy from your property, there are herbicides that may work. Please read and follow the directions exactly. The best thing to do with poison ivy is to avoid it! Thus, it is very important to be able to identify the plant. I will describe Western Poison Ivy because that is the plant that grows in Colorado. Please note that there is Eastern Poison Ivy that can look different than its Western counterpart. In addition, in other parts of the U.S. you need to watch for poison oak and poison sumac which are equally wicked and can be confused with poison ivy. As a perennial, poison ivy (Toxicodendron rydbergii) grows and dies back down every year. In our region, it usually grows to less than two to three feet in height (sub-shrub). In other regions it, and Eastern Poison Ivy, can grow as a shrub up to nine feet in height. The stems of Western Poison Ivy are either not branched (simple) or sparsely branched. Poison ivy has compound leaves made up of three-pointed leaflets. The center (terminal) leaflet has a longer leaf stalk (petiole) than the two side leaflets. The side leaflets are Continued on page 3 2 Wicked Weeds Continued from page 2 The edge of the leaves (margin) can be smooth or toothed. The size of the leaves varies greatly from less than 1/3” to over 2” in length. The leaves can be reddish in the spring when they first appear. In the summer, the leaves are green and sometimes glossy. In autumn, the leaves turn color, often a beautiful bright red, but they can also turn yellow or orange. The greenish colored flowers bloom from March to June. The flowers can branch (panicles) or be along a center stalk (racemes). The flowers have five sepals, united to the bottom of five petals. Poison ivy produces seeds ((drupes) – single seed covered in hard coating, think cherry pit). Initially, the drupes are green and look like mini pumpkins (globose), but they change color in autumn to white or yellowish white. People who did not know Poison Ivy fruit and flowers what poison ivy was, have harvested the pretty red leaves and cream berries to use in autumnal decorations. Ouch! My advice, admire this wicked weed from a distance and get fake foliage from a store. Educate yourself to identify poison ivy, so you can show this wicked weed the respect it deserves and stay away from it. Garden Tip: Fall and Winter Watering Now that cold temperatures are looming, many of us are ready to relax and forget about our outdoor plants. Your trees, shrubs, lawns, and perennials will thank you next spring if you practice good fall and winter watering techniques. Be sure to water during fall and winter when we haven’t had any precipitation for 2-3 weeks. Water on a day that is above 40° F, and do it in the early afternoon so the water has time to soak in before freezing nighttime temperatures. This will lead to much healthier, happier plants next season. African Rue By John Powell, Native Plant Master, 2008 Like a true alien aggressor, African rue has the ability to survive harsh conditions. During hot dry summer months, the plant dies back above ground and re -sprouts after summer rains. The plant resumes normal growth until a killing frost in the fall. African rue’s white petaled flowers can produce seed capsules twice each year. Deep cultivation only divides the roots with each piece being capable of producing a new plant. African Rue also spreads by suckers sent up from an extensive root system. This poisonous, basketball sized plant contains at least four alkaloids that are toxic to cattle, sheep and horses.
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